how to compare amount of values Actual vs Previous year?

Hi everyone,

I need your help please.

I have the following table with the orders from various years:

1)Now we want to compare the amount of orders from Actual Year(i.e.if I open my report today, then it will be 2016) and the Previous Year(in this case 2015) and present it after months(from January on):

where green and black bars present amount of orders from 2016 and 2015.

2)and as a next step I want to present:

- Number of orders,that have "spent time" > 30 days as a number

- List of orders that have "spent time" > 30 days as table

Filter after month/year

I assume, I should make a measure here, but how could I present WHERE-clause?

thanks a lot for advice!